[Bug] Booting the VM kernel gives "Internal error: undefined instruction: 0 [#1] SMP" on Volterra about firecracker

[jglathe]

Additional info: This is what CPU features Host and VM present to the kernel:

jglathe@sdbox2:~/firecracker$ journalctl -b -1 -g  "features: detected"
Okt 26 15:55:41 sdbox2 kernel: CPU features: detected: GIC system register CPU interface
Okt 26 15:55:41 sdbox2 kernel: CPU features: detected: Spectre-v4
Okt 26 15:55:41 sdbox2 kernel: CPU features: detected: Spectre-BHB
Okt 26 15:55:41 sdbox2 kernel: CPU features: detected: Kernel page table isolation (KPTI)
Okt 26 15:55:41 sdbox2 kernel: CPU features: detected: 32-bit EL0 Support
Okt 26 15:55:41 sdbox2 kernel: CPU features: detected: Data cache clean to the PoU not required for I/D coherence
Okt 26 15:55:41 sdbox2 kernel: CPU features: detected: Common not Private translations
Okt 26 15:55:41 sdbox2 kernel: CPU features: detected: CRC32 instructions
Okt 26 15:55:41 sdbox2 kernel: CPU features: detected: Data cache clean to Point of Persistence
Okt 26 15:55:41 sdbox2 kernel: CPU features: detected: RCpc load-acquire (LDAPR)
Okt 26 15:55:41 sdbox2 kernel: CPU features: detected: LSE atomic instructions
Okt 26 15:55:41 sdbox2 kernel: CPU features: detected: Privileged Access Never
Okt 26 15:55:41 sdbox2 kernel: CPU features: detected: RAS Extension Support
Okt 26 15:55:41 sdbox2 kernel: CPU features: detected: Speculative Store Bypassing Safe (SSBS)
Okt 26 15:55:41 sdbox2 kernel: CPU features: detected: Hardware dirty bit management on CPU0-7
jglathe@sdbox2:~/firecracker$ lxc exec ubuntu -- bash
root@ubuntu:~# sudo dmesg|grep "features: detected"
[    0.000000] CPU features: detected: GIC system register CPU interface
[    0.000000] CPU features: detected: Spectre-v4
[    0.000000] CPU features: detected: Spectre-BHB
[    0.000000] CPU features: detected: Kernel page table isolation (KPTI)
[    0.026448] CPU features: detected: 32-bit EL0 Support
[    0.026450] CPU features: detected: Data cache clean to the PoU not required for I/D coherence
[    0.026453] CPU features: detected: Common not Private translations
[    0.026454] CPU features: detected: CRC32 instructions
[    0.026456] CPU features: detected: Data cache clean to Point of Persistence
[    0.026459] CPU features: detected: RCpc load-acquire (LDAPR)
[    0.026461] CPU features: detected: LSE atomic instructions
[    0.026463] CPU features: detected: Privileged Access Never
[    0.026465] CPU features: detected: RAS Extension Support
[    0.026467] CPU features: detected: Speculative Store Bypassing Safe (SSBS)
[    0.028328] CPU features: detected: Hardware dirty bit management on CPU0-3
root@ubuntu:~# 

Does the VM just want to do something odd, like using SSBD even if it's not there?

[sudanl0]

Hi @jglathe,
Thank you for your query.
Sorry, but since we haven't tested the specific kernel/cpu configuration we cannot be of much help here.
A suggestion would be to try on any of our tested kernel configurations listed here to see if it works.